<template>
    <div class="add-role">
      <header class="add-header">
        <div class="left">
          <span class="arrow" @click="$router.back()"
            ><i class="el-icon-arrow-left" />返回</span
          >
          <span>|</span>
          <!-- 编辑或者添加显示标题 -->
          <span>{{ $route.query.id ? "编辑角色" : "添加角色" }}</span>
        </div>
        <div class="right">黑马程序员</div>
      </header>
      <main class="add-main">
        <div class="step-container">
          <!-- 步骤条 -->
          <el-steps direction="vertical" :active="activeStep">
            <el-step title="角色信息" />
            <el-step title="权限信息" />
            <el-step title="检查并完成" />
          </el-steps>
        </div>
        <div v-show="activeStep === 1" class="form-container">
          <div class="title">角色信息</div>
          <div class="form">
            <el-form
              class="form-box"
              ref="roleForm"
              :model="roleForm"
              :rules="roleRules"
            >
              <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="roleForm.roleName" />
              </el-form-item>
              <el-form-item label="角色描述">
                <el-input v-model="roleForm.remark" />
              </el-form-item>
            </el-form>
          </div>
        </div>
        <div v-show="activeStep === 2" class="form-container">
          <div class="title">权限配置</div>
          <div class="form">
            <div class="tree-wrapper">
              <div v-for="item in treeList" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>
                <el-tree
                  ref="tree"
                  :data="item.children"
                  show-checkbox
                  :default-expand-all="true"
                  node-key="id"
                  highlight-current
                  :props="{ label: 'title' }"
                />
              </div>
            </div>
          </div>
        </div>
        <div v-show="activeStep === 3" class="form-container">
          <div class="title">检查并完成</div>
          <div class="form">
            <div class="info">
              <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
              <div class="form-item">角色描述：{{ roleForm.remark }}</div>
              <div class="form-item">角色权限：</div>
              <div class="tree-wrapper">
                <div
                  v-for="item in disableTreeList"
                  :key="item.id"
                  class="tree-item"
                >
                  <!-- title -->
                  <div class="tree-title">{{ item.title }}</div>
                  <!-- 树形结构 -->
                  <el-tree
                    ref="diabledTree"
                    :props="{ label: 'title' }"
                    :data="item.children"
                    show-checkbox
                    :default-expand-all="true"
                    node-key="id"
                  />
                </div>
              </div>
            </div>
          </div>
        </div>
      </main>
      <footer class="add-footer">
        <div class="btn-container">
          <el-button v-if="activeStep > 1" @click="decreseStep">上一步</el-button>
          <el-button v-if="activeStep < 3" type="primary" @click="nextStep"
            >下一步</el-button
          >
          <el-button v-if="activeStep === 3" type="primary" @click="confirmAdd"
            >确认</el-button
          >
        </div>
      </footer>
    </div>
  </template>
    
  <script>
  import {
    getTreeListAPI,
    createRoleUserAPI,
    getRoleDetailAPI,
    updateRoleAPI,
  } from "@/api/sys";
  export default {
    data() {
      return {
        activeStep: 1,
        roleForm: {
          remark: "",
          roleName: "",
        },
        roleRules: {
          roleName: [
            { required: true, message: "请输入角色名称", trigger: "blur" },
          ],
        },
        treeList: [],
        disableTreeList: [],
        /* tree:[] */
      };
    },
    mounted() {
      this.getTreeList();
      if (this.$route.query.id) {
        this.getRoleDetail();
      }
    },
    methods: {
      //重新获取树
      async getTreeList() {
        const res = await getTreeListAPI();
        // 分开管理数据(引用类型 一个地方发生变化另一个地方也变 - 克隆一个副本)
        this.treeList = res.data;
  
        //克隆
        this.disableTreeList = JSON.parse(JSON.stringify(res.data));
        // 处理禁用
        addDisabled(this.disableTreeList);
      },
      //点击下一页时触发的检验函数
      nextStep() {
        if (this.activeStep === 3) return;
        if (this.activeStep === 1) {
          this.$refs.roleForm.validate((valid) => {
            if (valid) {
              // 校验通过才能进入下一个状态
              this.activeStep++;
            }
            if(this.$route.query.id){
            this.$nextTick(() => {
          // 回填Tree
          console.log(this.$refs.tree);
          this.$refs.tree.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index]);
          });
        });
      }
          });
        } else if (this.activeStep === 2) {
          // 当前是权限信息状态
          this.roleForm.perms = [];
          //填入选择的权限信息
          this.$refs.tree.forEach((tree) => {
            this.roleForm.perms.push(tree.getCheckedKeys());
          });
          // 如果长度为零 没有选中任何东西
          if (this.roleForm.perms.flat().length === 0) {
            this.$message.error("请至少选择一个权限点");
          } else {
            // 如果长度不为零，进入到检查并完成
            this.activeStep++;
            // 回填已选择数
            this.$refs.diabledTree.forEach((tree, index) => {
              tree.setCheckedKeys(this.roleForm.perms[index]);
            });
          }
        }
      },
      //添加或删除的接口封装函数
      confirmAdd() {
        // 编辑
        if (this.$route.query.id) {
          updateRoleAPI(this.roleForm);
          this.tree = [];
        } else {
          // 添加
          createRoleUserAPI(this.roleForm);
        }
        //返回成功提示框
        this.$message({
          type: "success",
          message: `${this.roleId ? "编辑" : "新增"}角色成功`,
        });
        this.$router.back();
      },
      //回填函数
      async getRoleDetail() {
        const res = await getRoleDetailAPI(this.roleId);
        const { perms, remark, roleId, roleName } = res.data;
        // 回填基础表单
        this.roleForm = { perms, remark, roleId, roleName };
        /* // 高亮权限列表
        const treeComponentList = this.$refs.tree;
        // 调用setCheckedKeys方法
        treeComponentList.forEach((tree, index) => {
          tree.setCheckedKeys(this.perms[index]);
        }); */
      },
      //上一页
      decreseStep() {
        if (this.activeStep === 1) return;
        this.activeStep--;
      },
    },
    //计算属性，缓存computed
    computed: {
      roleId() {
        return this.$route.query.id;
      },
    },
  };
  export function addDisabled(treeList) {
    treeList.forEach((item) => {
      item.disabled = true;
      // 递归处理
      if (item.children && item.children.length > 0) {
        addDisabled(item.children);
      }
    });
  }
  </script>
  
  <style scoped lang="scss">
  .add-role {
    background-color: #f4f6f8;
    height: 100vh;
  
    .add-header {
      display: flex;
      justify-content: space-between;
      padding: 0 20px;
      height: 64px;
      line-height: 64px;
      font-size: 16px;
      font-weight: bold;
      background-color: #fff;
  
      .left {
        span {
          margin-right: 4px;
        }
  
        .arrow {
          cursor: pointer;
        }
      }
  
      .right {
        text-align: right;
      }
    }
  
    .add-main {
      position: fixed;
      top: 64px;
      bottom: 88px;
      width: 100%;
      overflow-y: auto;
      background: #f4f6f8;
      padding: 20px 230px;
      display: flex;
  
      .step-container {
        height: 400px;
        width: 200px;
      }
  
      .form-container {
        flex: 1;
        background-color: #fff;
        overflow-y: auto;
  
        .title {
          height: 60px;
          line-height: 60px;
          padding-left: 20px;
        }
  
        .form {
          margin-bottom: 20px;
          padding: 20px 65px 24px;
  
          .el-form {
            display: flex;
            flex-wrap: wrap;
          }
  
          .info {
            font-size: 14px;
            color: #666;
  
            .form-item {
              margin-bottom: 20px;
            }
          }
        }
  
        .form-box {
          width: 600px;
          display: flex;
          flex-direction: column;
        }
      }
    }
  
    .add-footer {
      position: fixed;
      bottom: 0;
      width: 100%;
      padding: 24px 50px;
      color: #000000d9;
      font-size: 14px;
      background: #fff;
      text-align: center;
      z-index: 10001;
    }
  
    .tree-wrapper {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
  
      .tree-item {
        flex: 1;
        padding: 0px 4px;
        text-align: center;
  
        .tree-title {
          background: #f5f7fa;
          text-align: center;
          padding: 10px 0;
          margin-bottom: 12px;
        }
      }
    }
  }
  </style>